A vehicle body modal optimization method and system under TB state

Abstract

The present invention discloses a vehicle body modal optimization method and system in a TB state, and relates to the field of vehicle body modal optimization. The method comprises: balancing the mass of each subsystem to a corresponding installation position; retaining the connection between the vehicle frame structure and the body-in-white, and retaining the frame structure as a vehicle body structure; balancing the mass of the components carried on the frame structure to a corresponding installation position based on the RBE3 connection mode; balancing the electrical components of the vehicle to the vehicle body, thereby obtaining a simplified TB model; calculating the modality of the obtained simplified TB model, and identifying the TB state vehicle body modality; when the TB state vehicle body modality does not meet the target requirements, the vehicle body structure is optimized, and iterative verification is performed on the simplified TB model until the target requirements are met, and the modal lifting amount of the simplified TB model is superimposed on the vehicle body modal result in the TB state. The present invention can greatly improve the calculation efficiency.

Description

Technical Field

[0001] The present invention relates to the field of vehicle body modal optimization, and in particular to a vehicle body modal optimization method and system under TB state. Background Art

[0002] In the routine development process of automobile projects, the TB body (with four doors and two covers, frame, power battery, engine or power battery, storage battery, interior system, etc.) mode is used as a regular working condition. The TB body model mainly focuses on the self-mode of each subsystem, such as the mode of the body-in-white, door, hood, back door, battery pack, steering wheel and other subsystems. The body-in-white (body-in-white welding assembly and front and rear anti-collision beams, front section module) is used as a carrier. The body-in-white modal value in this state is often required to reach the target value, but due to factors such as large model, low calculation efficiency, and difficulty in modal identification, this optimization work is difficult to carry out efficiently. TB, namely Trimmed Body, refers to the remaining part of the vehicle after the soft connection (spring, bushing) is disconnected and the powertrain and chassis system are removed.

[0003] At present, for the optimization of body modal, based on the TB body modal calculation results, the first-order bending mode of the body is identified and then optimized. Sometimes, due to identification errors, the optimization direction is wrong. There are also modal identification conditions that can be added to further identify the mode in order to accurately determine the body-in-white mode in the TB state. Due to the large size of the model and the low computational efficiency, the autonomous modal identification after each optimization is also relatively difficult, resulting in low optimization efficiency.

[0004] It can be seen that the current optimization of vehicle body modes has problems such as difficult and error-prone modal identification, long calculation period, and low efficiency. Summary of the invention

[0005] In view of the defects existing in the prior art, the object of the present invention is to provide a method and system for optimizing the vehicle body modal under the TB state, which can greatly improve the calculation efficiency.

[0006] In order to achieve the above objectives, the present invention provides a vehicle body modal optimization method under TB state, which specifically includes the following steps:

[0007] Based on the RBE3 connection method, the mass of each subsystem is balanced to the corresponding installation position;

[0008] The connection between the vehicle's frame structure and the body-in-white is retained, and the frame structure is retained as the body structure;

[0009] Based on the RBE3 connection method, the mass of the components carried on the frame structure is counterbalanced to the corresponding installation positions;

[0010] The vehicle's electrical components are weighted onto the vehicle body to obtain a simplified TB model;

[0011] Calculate the modes of the obtained simplified TB model and identify the body modes in the TB state;

[0012] When the body modal in the TB state does not meet the target requirements, the body structure is optimized and iterative verification is performed on the simplified TB model until the target requirements are met. The modal improvement of the simplified TB model is superimposed on the body modal result in the TB state.

[0013] Based on the above technical solution, the subsystem includes an opening piece and interior and exterior trims.

[0014] On the basis of the above technical solution, the mass of each subsystem is balanced to the corresponding installation position based on the RBE3 connection method. The specific steps include:

[0015] Based on the geometric data, the mass center of each subsystem is obtained;

[0016] Establish an RBE3 connection between the mass center position of each subsystem and the corresponding installation position on the vehicle body;

[0017] Balance the mass of each subsystem to the corresponding installation position.

[0018] Based on the above technical solution, the frame structure includes front and rear subframes and a battery frame.

[0019] On the basis of the above technical solution, the RBE3 connection method is used to balance the mass of the components carried by the frame structure to the corresponding installation positions. The specific steps include:

[0020] Based on the geometric data, the mass center of the components carried by the frame structure is obtained;

[0021] Establish an RBE3 connection between the mass center position of the component carried on the frame structure and the corresponding component installation position on the frame structure;

[0022] The mass of the components carried on the frame structure is counterweighted to the corresponding component installation positions.

[0023] On the basis of the above technical solution, after the modal improvement of the simplified TB model is superimposed on the body modal result of the TB state, it also includes: superimposing the body structure optimization solution on the TB state body modal model for modal verification.

[0024] On the basis of the above technical solution, the vehicle body structure optimization solution is superimposed on the TB state vehicle body modal model for modal verification, wherein the verification result is:

[0025] When the TB state body mode is an independent body state, if the target requirements are met after verification, the optimization of the white body mode of the simplified TB model is stopped;

[0026] When the TB state body mode is coupled with other subsystems:

[0027] - If the coupling is a mode dominated by the body-in-white, the body-in-white mode in the TB state can be improved after verification. If it still does not meet the target requirements, the body-in-white mode of the simplified TB model is optimized and superimposed on the body-in-white mode model in the TB state for verification;

[0028] -If the coupling is the dominant mode of the subsystem and does not meet the optimization goal, the subsystem is optimized.

[0029] The present invention provides a vehicle body modal optimization system in a TB state, comprising:

[0030] The first weight balancing module is used to balance the mass of each subsystem to the corresponding installation position based on the RBE3 connection mode;

[0031] A retention module, which is used to retain the connection between the vehicle's frame structure and the body-in-white, and retain the frame structure as the body structure;

[0032] A second weight balancing module, which is used to balance the mass of the components carried by the frame structure to the corresponding installation position based on the RBE3 connection mode;

[0033] A third weight balancing module is used to balance the electrical components of the vehicle to the vehicle body, thereby obtaining a simplified TB model;

[0034] A calculation module, which is used to calculate the mode of the obtained simplified TB model and identify the body mode of the TB state;

[0035] The optimization module is used to optimize the body structure when the body modal in the TB state does not meet the target requirements. It performs iterative verification on the simplified TB model until the target requirements are met, and superimposes the modal improvement of the simplified TB model on the body modal result in the TB state.

[0036] Based on the above technical solution, the subsystem includes an opening piece and interior and exterior trims.

[0037] On the basis of the above technical solution, the mass of each subsystem is balanced to the corresponding installation position based on the RBE3 connection method. The specific process includes:

[0038] Based on the geometric data, the mass center of each subsystem is obtained;

[0039] Establish an RBE3 connection between the mass center position of each subsystem and the corresponding installation position on the vehicle body;

[0040] Balance the mass of each subsystem to the corresponding installation position.

[0041] Compared with the prior art, the advantages of the present invention are as follows: by simplifying the TB body model, the calculation amount of the model is reduced, and the optimization efficiency of the TB state body-in-white mode is improved. At the same time, the simplified TB body model ignores the contribution of the stiffness of the subsystem to the body-in-white, and retains the influence of the mass and mass distribution of the subsystem on the body-in-white, so that the vibration shape of the simplified TB body model is consistent with the vibration shape of the actual TB model. In actual application, the actual TB model is optimized by optimizing the simplified TB body model. Although there is a small difference in the absolute values ​​of the modes of the two models, the modal increments remain consistent, so that the calculation efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 The figure is a flow chart of a vehicle body modal optimization method under TB state in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The embodiment of the present invention provides a vehicle body modal optimization method under TB state, which simplifies the TB vehicle body model, reduces the amount of model calculation, and improves the optimization efficiency of the BIW modal under TB state. At the same time, the simplified TB vehicle body model ignores the contribution of the stiffness of the subsystem to the BIW, and retains the influence of the mass and mass distribution of the subsystem on the BIW, so that the vibration shape of the simplified TB vehicle body model is consistent with the vibration shape of the actual TB model. In actual application, the actual TB model is optimized by optimizing the simplified TB vehicle body model. Although there is a small difference in the absolute values ​​of the modes of the two models, the modal increments remain consistent, so that the calculation efficiency is greatly improved. The embodiment of the present invention also provides a vehicle body modal optimization system under TB state accordingly.

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0046] See also Figure 1 As shown, a vehicle body modal optimization method under TB state provided by an embodiment of the present invention specifically includes the following steps:

[0047] S1: Based on the RBE3 (direct load transfer) connection method, the mass of each subsystem is balanced to the corresponding installation position; in the present invention, the subsystem includes opening parts and internal and external trims.

[0048] It should be noted that the mode is affected by the stiffness and mass of the structure. It is found in practice that opening parts and interior and exterior trims have little effect on the overall mode of the body-in-white. Therefore, the structure (stiffness) of the opening parts and interior and exterior trims can be ignored, and the mass of the opening parts and interior and exterior trims can be retained for the overall mode. The mass configuration of the opening parts and interior and exterior trims is applied to the body-in-white.

[0049] In the present invention, based on the RBE3 connection mode, the mass of each subsystem is balanced to the corresponding installation position, and the specific steps include:

[0050] S101: Obtain the mass center of mass of each subsystem based on geometric data; that is, calculate the mass center of mass of each subsystem according to the shape and spatial position of each subsystem.

[0051] S102: establishing an rbe3 connection between the mass center position of each subsystem and the corresponding installation position on the vehicle body;

[0052] S103: The mass of each subsystem is balanced to the corresponding installation position. For example, for a vehicle door, the corresponding installation position on the vehicle body is the connection position between the vehicle door and the vehicle body, and an RBE3 connection is established between the mass center position of the vehicle door and the connection position, and then the mass of the vehicle door is balanced to the connection position.

[0053] S2: retain the connection between the vehicle frame structure and the body-in-white, and retain the frame structure as the body structure;

[0054] In the present invention, the frame structure includes front and rear subframes and a battery frame. For the frame structures such as the front and rear subframes and the battery frame, these structures are rigidly connected or nearly rigidly connected to the vehicle body, and the actual structure needs to be retained to be connected to the body-in-white and exist as part of the vehicle body structure.

[0055] S3: Based on the RBE3 connection method, the mass of the components carried by the frame structure is counterweighted to the corresponding installation position. The components carried by the frame structure include the engine, battery pack, water tank, etc.

[0056] In the present invention, based on the RBE3 connection method, the mass of the components carried by the frame structure is counterweighted to the corresponding installation position, and the specific steps include:

[0057] S301: Obtaining the mass center of mass of the components carried by the frame structure based on the geometric data;

[0058] S302: establishing an rbe3 connection between the mass center position of the component carried by the frame structure and the corresponding component installation position on the frame structure;

[0059] S303: Balance the mass of the components carried on the frame structure to the corresponding component installation position. For example, for a battery pack carried on a battery frame, the corresponding component installation position on the frame structure is the connection position between the battery pack and the battery frame, then establish an RBE3 connection between the mass center position of the battery pack carried on the battery frame and the connection position, and balance the mass of the battery pack carried on the battery frame to the connection position.

[0060] S4: The electrical components of the vehicle are weighted onto the vehicle body to obtain a simplified TB model;

[0061] S5: Calculate the modes of the obtained simplified TB model and identify the TB state body mode;

[0062] S6: When the body modal in the TB state does not meet the target requirements, the body structure is optimized and iterative verification is performed on the simplified TB model until the target requirements are met. The modal improvement of the simplified TB model is superimposed on the body modal result in the TB state.

[0063] In the present invention, after the modal improvement of the simplified TB model is superimposed on the body modal result of the TB state, it also includes: superimposing the body structure optimization scheme on the TB state body modal model for modal verification. That is, after the increment of the white body modal optimization of the simplified TB model is superimposed on the body modal of the TB state, if the target is met (some pre-measurements can be appropriately reserved), the body structure optimization scheme can be placed on the body modal model of the TB state for verification. For example, as shown in Table 1 below.

[0064] Table 1

[0065]

[0066] In the present invention, the vehicle body structure optimization scheme is superimposed on the TB state vehicle body modal model to perform modal verification, wherein the verification result is:

[0067] When the body mode in the TB state is an independent body state, if it meets the target requirements after verification, the optimization of the body-in-white mode of the simplified TB model is stopped; that is, if the body mode in the TB state is relatively pure, it can generally meet the target, and the optimization work is stopped.

[0068] When the TB state body mode is coupled with other subsystems:

[0069] - If the coupling is a mode dominated by the body-in-white, the TB state body mode can be improved after verification. If it still does not meet the target requirements, continue to optimize the TB model's BIW mode and superimpose it on the TB state body modal model for verification; even if the coupling is sometimes a mode dominated by the body-in-white, it is generally improved after verification, but it may still not meet the optimization target, so it is necessary to continue to optimize.

[0070] -If coupling is the dominant mode of the subsystem and does not meet the optimization goal, the subsystem is optimized; that is, when the optimization result does not meet the optimization goal, the subsystem structure needs to be optimized and the body cannot be optimized, otherwise it will be an ineffective optimization work.

[0071] The vehicle body modal optimization method under the TB state of the embodiment of the present invention simplifies the TB vehicle body model, reduces the calculation amount of the model, and improves the optimization efficiency of the BIW modal under the TB state. At the same time, the simplified TB vehicle body model ignores the contribution of the stiffness of the subsystem to the BIW, and retains the influence of the mass and mass distribution of the subsystem on the BIW, so that the vibration shape of the simplified TB vehicle body model is consistent with the vibration shape of the actual TB model. In actual application, the actual TB model is optimized by optimizing the simplified TB vehicle body model. Although there is a difference of about 1 Hz in the absolute values ​​of the modes of the two models, the modal increments remain consistent, so that the calculation efficiency is greatly improved.

[0072] In a possible implementation manner, an embodiment of the present invention further provides a readable storage medium, the readable storage medium is located in a PLC (Programmable Logic Controller) controller, and a computer program is stored on the readable storage medium. When the program is executed by a processor, the following steps of the vehicle body modal optimization method under the TB state are implemented:

[0073] Based on the RBE3 connection method, the mass of each subsystem is balanced to the corresponding installation position;

[0074] The connection between the vehicle's frame structure and the body-in-white is retained, and the frame structure is retained as the body structure;

[0075] Based on the RBE3 connection method, the mass of the components carried on the frame structure is counterbalanced to the corresponding installation positions;

[0076] The vehicle's electrical components are weighted onto the vehicle body to obtain a simplified TB model;

[0077] Calculate the modes of the obtained simplified TB model and identify the body modes in the TB state;

[0078] When the body modal in the TB state does not meet the target requirements, the body structure is optimized and iterative verification is performed on the simplified TB model until the target requirements are met. The modal improvement of the simplified TB model is superimposed on the body modal result in the TB state.

[0079] In the present invention, the subsystem includes opening parts and interior and exterior trims. Based on the RBE3 connection method, the mass of each subsystem is weighted to the corresponding installation position. The specific steps include:

[0080] Based on the geometric data, the mass center of each subsystem is obtained;

[0081] Establish an RBE3 connection between the mass center position of each subsystem and the corresponding installation position on the vehicle body;

[0082] Balance the mass of each subsystem to the corresponding installation position.

[0083] In the present invention, the frame structure includes front and rear subframes and a battery frame. Based on the RBE3 connection method, the mass of the components carried by the frame structure is counterweighted to the corresponding installation position. The specific steps include:

[0084] Based on the geometric data, the mass center of the components carried by the frame structure is obtained;

[0085] Establish an RBE3 connection between the mass center position of the component carried on the frame structure and the corresponding component installation position on the frame structure;

[0086] The mass of the components carried on the frame structure is counterweighted to the corresponding component installation positions.

[0087] In the present invention, after the modal lift of the simplified TB model is superimposed on the body modal result of the TB state, the method further includes: superimposing the body structure optimization scheme on the TB state body modal model for modal verification.

[0088] The TB state body modal model is verified, and the verification results are as follows:

[0089] When the TB state body mode is an independent body state, if the target requirements are met after verification, the optimization of the white body mode of the simplified TB model is stopped;

[0090] When the TB state body mode is coupled with other subsystems:

[0091] - If the coupling is a mode dominated by the body-in-white, the body-in-white mode in the TB state can be improved after verification. If it still does not meet the target requirements, the body-in-white mode of the simplified TB model is optimized and superimposed on the body-in-white mode model in the TB state for verification;

[0092] -If the coupling is the dominant mode of the subsystem and does not meet the optimization goal, the subsystem is optimized.

[0093] The storage medium may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to: an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device or device.

[0094] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, device, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0095] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0096] An embodiment of the present invention provides a vehicle body modal optimization system in a TB state, comprising a first counterweight module, a retention module, a second counterweight module, a third counterweight module, a calculation module and an optimization module.

[0097] The first weight balancing module is used to balance the mass of each subsystem to the corresponding installation position based on the rbe3 connection method; the retention module is used to retain the connection between the vehicle's frame structure and the body-in-white, and retain the frame structure as the body structure; the second weight balancing module is used to balance the mass of the components carried on the frame structure to the corresponding installation position based on the rbe3 connection method; the third weight balancing module is used to balance the vehicle's electrical components to the body, thereby obtaining a simplified TB model; the calculation module is used to calculate the mode of the obtained simplified TB model and identify the TB state body mode; the optimization module is used to optimize the body structure when the TB state body mode does not meet the target requirements, and iteratively verify on the simplified TB model until the target requirements are met, and the modal lift of the simplified TB model is superimposed on the TB state body modal result.

[0098] The mode is affected by the structural stiffness and mass. It is found in practice that opening parts and interior and exterior trims have little effect on the overall mode of the body-in-white. Therefore, the structure (stiffness) of the opening parts and interior and exterior trims can be ignored, and the mass of the opening parts and interior and exterior trims can be retained for the overall mode. The mass of the opening parts and interior and exterior trims is allocated to the body-in-white.

[0099] In the present invention, the subsystem includes opening parts and interior and exterior trims. Based on the RBE3 connection method, the mass of each subsystem is weighted to the corresponding installation position. The specific process includes:

[0100] Based on the geometric data, the mass center of each subsystem is obtained;

[0101] Establish an RBE3 connection between the mass center position of each subsystem and the corresponding installation position on the vehicle body;

[0102] Balance the mass of each subsystem to the corresponding installation position.

[0103] In the present invention, the frame structure includes front and rear subframes and a battery frame. Based on the RBE3 connection method, the mass of the components carried by the frame structure is counterbalanced to the corresponding installation positions. The specific process includes:

[0104] Based on the geometric data, the mass center of the components carried by the frame structure is obtained;

[0105] Establish an RBE3 connection between the mass center position of the component carried on the frame structure and the corresponding component installation position on the frame structure;

[0106] The mass of the components carried on the frame structure is counterweighted to the corresponding component installation positions.

[0107] In the present invention, after the modal lift of the simplified TB model is superimposed on the body modal result of the TB state, the method further includes: superimposing the body structure optimization scheme on the TB state body modal model for modal verification.

[0108] The TB state body modal model is verified, and the verification results are as follows:

[0109] When the TB state body mode is an independent body state, if the target requirements are met after verification, the optimization of the white body mode of the simplified TB model is stopped;

[0110] When the TB state body mode is coupled with other subsystems:

[0111] - If the coupling is a mode dominated by the body-in-white, the body-in-white mode in the TB state can be improved after verification. If it still does not meet the target requirements, the body-in-white mode of the simplified TB model is optimized and superimposed on the body-in-white mode model in the TB state for verification;

[0112] -If the coupling is the dominant mode of the subsystem and does not meet the optimization goal, the subsystem is optimized.

[0113] The vehicle body modal optimization system in the TB state of the embodiment of the present invention simplifies the TB vehicle body model, reduces the calculation amount of the model, and improves the optimization efficiency of the BIW modal in the TB state. At the same time, the simplified TB vehicle body model ignores the contribution of the stiffness of the subsystem to the BIW, and retains the influence of the mass and mass distribution of the subsystem on the BIW, so that the vibration shape of the simplified TB vehicle body model is consistent with the vibration shape of the actual TB model. In actual application, the actual TB model is optimized by optimizing the simplified TB vehicle body model. Although there is a small difference in the absolute values ​​of the modes of the two models, the modal increments remain consistent, so that the calculation efficiency is greatly improved.

[0114] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

[0115] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

Claims

1. A vehicle body modal optimization method under TB state, characterized in that: The specific steps include: Based on the RBE3 connection method, the mass of each subsystem is balanced to the corresponding installation position; The connection between the vehicle's frame structure and the body-in-white is retained, and the frame structure is retained as the body structure; Based on the RBE3 connection method, the mass of the components carried on the frame structure is counterbalanced to the corresponding installation positions; The vehicle's electrical components are weighted onto the vehicle body to obtain a simplified TB model; Calculate the modes of the obtained simplified TB model and identify the body modes in the TB state; When the body modal in the TB state does not meet the target requirements, the body structure is optimized and iterative verification is performed on the simplified TB model until the target requirements are met. The modal improvement of the simplified TB model is superimposed on the body modal result in the TB state. Among them, the subsystem includes opening parts and interior and exterior trims, and the frame structure includes front and rear subframes and a battery frame.

2. The vehicle body modal optimization method under TB state as claimed in claim 1, characterized in that: Based on the RBE3 connection method, the mass of each subsystem is balanced to the corresponding installation position, and the specific steps include: Based on the geometric data, the mass center of each subsystem is obtained; Establish an RBE3 connection between the mass center position of each subsystem and the corresponding installation position on the vehicle body; Balance the mass of each subsystem to the corresponding installation position.

3. The vehicle body modal optimization method under TB state as claimed in claim 1, characterized in that: Based on the RBE3 connection method, the mass of the components carried by the frame structure is counterweighted to the corresponding installation position, and the specific steps include: Based on the geometric data, the mass center of the components carried by the frame structure is obtained; Establish an RBE3 connection between the mass center position of the component carried on the frame structure and the corresponding component installation position on the frame structure; The mass of the components carried on the frame structure is counterweighted to the corresponding component installation positions.

4. The vehicle body modal optimization method under TB state as claimed in claim 1, characterized in that: After the modal improvement of the simplified TB model is superimposed on the body modal result of the TB state, it also includes: superimposing the body structure optimization scheme on the TB state body modal model for modal verification.

5. The vehicle body modal optimization method under TB state as claimed in claim 4, characterized in that: The vehicle body structure optimization scheme is superimposed on the TB state vehicle body modal model to perform modal verification, wherein the verification result is: When the TB state body mode is an independent body state, if the target requirements are met after verification, the optimization of the white body mode of the simplified TB model is stopped; When the TB state body mode is coupled with other subsystems: - If the coupling is a mode dominated by the body-in-white, the body-in-white mode in the TB state can be improved after verification. If it still does not meet the target requirements, the body-in-white mode of the simplified TB model is optimized and superimposed on the body-in-white mode model in the TB state for verification; -If the coupling is the dominant mode of the subsystem and does not meet the optimization goal, the subsystem is optimized.

6. A vehicle body modal optimization system under TB state, characterized in that: include: The first weight balancing module is used to balance the mass of each subsystem to the corresponding installation position based on the RBE3 connection mode; A retention module, which is used to retain the connection between the vehicle's frame structure and the body-in-white, and retain the frame structure as the body structure; A second weight balancing module, which is used to balance the mass of the components carried by the frame structure to the corresponding installation position based on the RBE3 connection mode; A third weight balancing module is used to balance the electrical components of the vehicle to the vehicle body, thereby obtaining a simplified TB model; A calculation module, which is used to calculate the mode of the obtained simplified TB model and identify the body mode of the TB state; The optimization module is used to optimize the body structure when the body modality in the TB state does not meet the target requirements, and iteratively verify on the simplified TB model until the target requirements are met, and superimpose the modal improvement of the simplified TB model on the body modal result in the TB state; Among them, the subsystem includes opening parts and interior and exterior trims, and the frame structure includes front and rear subframes and a battery frame.

7. A vehicle body modal optimization system in TB state as claimed in claim 6, characterized in that: Based on the RBE3 connection method, the mass of each subsystem is balanced to the corresponding installation position. The specific process includes: Based on the geometric data, the mass center of each subsystem is obtained; Establish an RBE3 connection between the mass center position of each subsystem and the corresponding installation position on the vehicle body; Balance the mass of each subsystem to the corresponding installation position.

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